bp_core_current_user_ip()

function bp_core_current_user_ip() {
	$retval = preg_replace( '/[^0-9a-fA-F:., ]/', '', $_SERVER['REMOTE_ADDR'] );

	/**
	 * Filters the current user's IP address.
	 *
	 * @since BuddyPress 1.6.0
	 *
	 * @param string $retval Current user's IP Address.
	 */
	return apply_filters( 'bp_core_current_user_ip', $retval );
}